Improvement in millstone-dress



. H. WOHL BBBBB G.

Millstone Dress.

P a t e n t e d 0 o t l 8 1 8 7 0.

gaunt epic.

JOHN P. H. 'W'OH'LENBERGQOF LYONS, IOWA.

Letters Patent No. 108,422, dated was 18, 1870.

IMPROVEMENT m MlLLSTONE-DRESS.

The Schedule referred to in these Iaetters Patent: and making part of the same I, JOHN I. H. WonLEsBEBs, of Lyons, county of Clinton, State of Iowa, have invented certain Improvements in Millstones, of which the following is a specification.

My invention relates to the formation ofan airspace or draught-chamber in each leading furrow of the upper or running-stone ofa flouriug-mill, by cutting a recess in the bottom thereof, from the eye of the stone outwardly to a point about midway the length of the leading furrow, (so as' to reach beyond the departure therefrom of the outer branch fnrrow,) and of a depth at the outer end twice that of the leading furrow, and which increases gradually thence until it opens into the eye the object of said invention being to facilitate the ventilation of the stone by the introduction and distribution oi air from the eye over the-grinding surfaces of the stone.

,Ih'seriplion of (he Accompanying Drawing.

0, the sockets to receive the bail.

I) 1) D, &c., represent the main grinding-furrows leading from thceye of the stone.

N N N, 810., branch gririding-furrows, leading from the leading furrows.

P, top millstonc.

Construction and Operation.

1 cut'the air-chambers or recesses a a. a, &c., into the stone about two and a half 7 inches deep at the eye, and two inches wide, and taper them to one-half inch deep by three-fourths inch wide at the end of said furrow, the end passing a little beyond the line of the branch grinding-furrow, as shown in fig. 1. These air-chambers are out longitudinally in the bottom of the main furrows.

a, fig. 3, shows a longitudinal section of the airchamber or recess, and

a, fig. 4, shows a cross-section of said recess at J,

After cutting, these air-recesses I hang the stone in the usual way, having the grinding-furrows in both the upper and under stone, in any form or shape, only they must all run to the air-furrows.

1n grinding, the motionof the running-stone sends the air in large quantities through the recesses a. a. a,

&c., and the grinding-furrows opening thereinto receive the air at the point of grinding, so that it iningles with the grain during the whole process of grinding, thereby preventing undue heat, and, consequently, injury to the flour.

1 do not claim any particular arrangement of grindmg-furrows.

Claim.

1 claim as in y in\'eniion--- he inillstonc-dress herein described, consisting of the tangential furrows D D, branch-furrows N N, and air-chambers or recesses a. a, all constructed and arranged as shown, and for the purpose set forth.

In witness whereof, I have hereunto set my hand and aiiixed my name, in the presence of two witnesses, on this 12th day of August, A. D. 1870.

Witnesses J OHN 1. H. \VOHLENBER-C.

WM. W. SANBORX, l). W. Ennis. 

